1 /* 2 * linux/mm/slab.h 3 * Written by Mark Hemment, 1996. 4 * ([email protected]) 5 */ 6 7 #ifndef _LINUX_SLAB_H 8 #define _LINUX_SLAB_H 9 10 #if defined(__KERNEL__) 11 12 typedef struct kmem_cache kmem_cache_t; 13 14 #include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */ 15 #include <linux/gfp.h> 16 #include <linux/init.h> 17 #include <linux/types.h> 18 #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ 19 #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ 20 21 /* flags for kmem_cache_alloc() */ 22 #define SLAB_NOFS GFP_NOFS 23 #define SLAB_NOIO GFP_NOIO 24 #define SLAB_ATOMIC GFP_ATOMIC 25 #define SLAB_USER GFP_USER 26 #define SLAB_KERNEL GFP_KERNEL 27 #define SLAB_DMA GFP_DMA 28 29 #define SLAB_LEVEL_MASK GFP_LEVEL_MASK 30 31 #define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */ 32 33 /* flags to pass to kmem_cache_create(). 34 * The first 3 are only valid when the allocator as been build 35 * SLAB_DEBUG_SUPPORT. 36 */ 37 #define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */ 38 #define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */ 39 #define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */ 40 #define SLAB_POISON 0x00000800UL /* Poison objects */ 41 #define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */ 42 #define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */ 43 #define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */ 44 #define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */ 45 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate 46 what is reclaimable later*/ 47 #define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */ 48 #define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */ 49 #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ 50 51 /* flags passed to a constructor func */ 52 #define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */ 53 #define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */ 54 #define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */ 55 56 #ifndef CONFIG_SLOB 57 58 /* prototypes */ 59 extern void __init kmem_cache_init(void); 60 61 extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long, 62 void (*)(void *, kmem_cache_t *, unsigned long), 63 void (*)(void *, kmem_cache_t *, unsigned long)); 64 extern int kmem_cache_destroy(kmem_cache_t *); 65 extern int kmem_cache_shrink(kmem_cache_t *); 66 extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t); 67 extern void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 68 extern void kmem_cache_free(kmem_cache_t *, void *); 69 extern unsigned int kmem_cache_size(kmem_cache_t *); 70 extern const char *kmem_cache_name(kmem_cache_t *); 71 extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags); 72 73 /* Size description struct for general caches. */ 74 struct cache_sizes { 75 size_t cs_size; 76 kmem_cache_t *cs_cachep; 77 kmem_cache_t *cs_dmacachep; 78 }; 79 extern struct cache_sizes malloc_sizes[]; 80 81 extern void *__kmalloc(size_t, gfp_t); 82 #ifndef CONFIG_DEBUG_SLAB 83 #define ____kmalloc(size, flags) __kmalloc(size, flags) 84 #else 85 extern void *__kmalloc_track_caller(size_t, gfp_t, void*); 86 #define ____kmalloc(size, flags) \ 87 __kmalloc_track_caller(size, flags, __builtin_return_address(0)) 88 #endif 89 90 static inline void *kmalloc(size_t size, gfp_t flags) 91 { 92 if (__builtin_constant_p(size)) { 93 int i = 0; 94 #define CACHE(x) \ 95 if (size <= x) \ 96 goto found; \ 97 else \ 98 i++; 99 #include "kmalloc_sizes.h" 100 #undef CACHE 101 { 102 extern void __you_cannot_kmalloc_that_much(void); 103 __you_cannot_kmalloc_that_much(); 104 } 105 found: 106 return kmem_cache_alloc((flags & GFP_DMA) ? 107 malloc_sizes[i].cs_dmacachep : 108 malloc_sizes[i].cs_cachep, flags); 109 } 110 return __kmalloc(size, flags); 111 } 112 113 extern void *__kzalloc(size_t, gfp_t); 114 115 static inline void *kzalloc(size_t size, gfp_t flags) 116 { 117 if (__builtin_constant_p(size)) { 118 int i = 0; 119 #define CACHE(x) \ 120 if (size <= x) \ 121 goto found; \ 122 else \ 123 i++; 124 #include "kmalloc_sizes.h" 125 #undef CACHE 126 { 127 extern void __you_cannot_kzalloc_that_much(void); 128 __you_cannot_kzalloc_that_much(); 129 } 130 found: 131 return kmem_cache_zalloc((flags & GFP_DMA) ? 132 malloc_sizes[i].cs_dmacachep : 133 malloc_sizes[i].cs_cachep, flags); 134 } 135 return __kzalloc(size, flags); 136 } 137 138 /** 139 * kcalloc - allocate memory for an array. The memory is set to zero. 140 * @n: number of elements. 141 * @size: element size. 142 * @flags: the type of memory to allocate. 143 */ 144 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 145 { 146 if (n != 0 && size > ULONG_MAX / n) 147 return NULL; 148 return kzalloc(n * size, flags); 149 } 150 151 extern void kfree(const void *); 152 extern unsigned int ksize(const void *); 153 154 #ifdef CONFIG_NUMA 155 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node); 156 extern void *kmalloc_node(size_t size, gfp_t flags, int node); 157 #else 158 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node) 159 { 160 return kmem_cache_alloc(cachep, flags); 161 } 162 static inline void *kmalloc_node(size_t size, gfp_t flags, int node) 163 { 164 return kmalloc(size, flags); 165 } 166 #endif 167 168 extern int FASTCALL(kmem_cache_reap(int)); 169 extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr)); 170 171 #else /* CONFIG_SLOB */ 172 173 /* SLOB allocator routines */ 174 175 void kmem_cache_init(void); 176 struct kmem_cache *kmem_find_general_cachep(size_t, gfp_t gfpflags); 177 struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t, 178 unsigned long, 179 void (*)(void *, struct kmem_cache *, unsigned long), 180 void (*)(void *, struct kmem_cache *, unsigned long)); 181 int kmem_cache_destroy(struct kmem_cache *c); 182 void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags); 183 void *kmem_cache_zalloc(struct kmem_cache *, gfp_t); 184 void kmem_cache_free(struct kmem_cache *c, void *b); 185 const char *kmem_cache_name(struct kmem_cache *); 186 void *kmalloc(size_t size, gfp_t flags); 187 void *__kzalloc(size_t size, gfp_t flags); 188 void kfree(const void *m); 189 unsigned int ksize(const void *m); 190 unsigned int kmem_cache_size(struct kmem_cache *c); 191 192 static inline void *kcalloc(size_t n, size_t size, gfp_t flags) 193 { 194 return __kzalloc(n * size, flags); 195 } 196 197 #define kmem_cache_shrink(d) (0) 198 #define kmem_cache_reap(a) 199 #define kmem_ptr_validate(a, b) (0) 200 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f) 201 #define kmalloc_node(s, f, n) kmalloc(s, f) 202 #define kzalloc(s, f) __kzalloc(s, f) 203 #define ____kmalloc kmalloc 204 205 #endif /* CONFIG_SLOB */ 206 207 /* System wide caches */ 208 extern kmem_cache_t *vm_area_cachep; 209 extern kmem_cache_t *names_cachep; 210 extern kmem_cache_t *files_cachep; 211 extern kmem_cache_t *filp_cachep; 212 extern kmem_cache_t *fs_cachep; 213 extern kmem_cache_t *sighand_cachep; 214 extern kmem_cache_t *bio_cachep; 215 216 extern atomic_t slab_reclaim_pages; 217 218 #endif /* __KERNEL__ */ 219 220 #endif /* _LINUX_SLAB_H */ 221